Added parsy to 'Text Processing / Parsers' section

[spookylukey]

What is this Python project?

It's a parser combinator library for creating text parsers and/or lexers.

What's the difference between this Python project and similar ones?

It is similar to pyparsing in terms of approach (i.e. parser combinator), but benefits from:

• Borrowing from the best of parser combinator libraries from other languages (like Parsec from Haskell) etc.
• Much nicer, smaller and cleaner implementation.
• A focus on generating nicely structured results i.e. your own custom data types, rather list-of-lists that then need further (often fragile) handling.
• Excellent, up to date documentation, including all the different types you want - tutorial, reference and examples - all in once place.
• Modern best practices with everything you'd expect from a modern project on GitHub rather than SourceForge - 100% test coverage, Travis/Codecov/Read The Docs integration etc.

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Anyone who agrees with this pull request could vote for it by adding a 👍 to it, and usually, the maintainer will merge it when votes reach 20.

[spookylukey]

Could this be merged now @vinta ? I can rebase if needed.

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[spookylukey]

This PR is ready for merging, and has the required votes. What else am I supposed to be doing?

[ruancomelli]

@vinta could you please take a look at this PR? I'd love to see parsy among the other awesome libraries 😎